Types OF LEVELLING OPERATION
1.Simple leveling When the difference of level between two points is determined by setting the leveling instrument midway between the...
Perfect leveling by foot screws
As the longitudinal bubble is on the top of be telescope, the latter is placed parallel to any pair of foot screws (i.e. first position)...
TEMPORARY ADJUSMENT O FLEVEL
The adjustment made at every set up of the level before the staff readmes at taken are known as temporary adjustments. The following are...
Points to be remembered by level man
1; the leveling instrument should be placed at a position suitable for the greatest number of observations to be taken. 2; the instrument...
DIA PHRAGM
DIA PHRAGM; the diaphragm is a brass ring fitted inside the telescope, just in front of the eye-piece, ft can he adjusted by four screws....
Laser level
The laser beam project employs a rotating head with a mirror for sweeping the laser beam about a vertical axis. If the mirror is not...
Different type of levels
The following are the different types of level; the dumpy level; the telescope of the dump level is rigidly fixed to its supports, it...
Arbitrary Bench-marks
When the RLs of some fixed points are assumed, they are termed arbitrary bench-marks. These are adopted in small survey operations when...
Line of collimation
Line of collimation It is an imaginary line passing through the intersection of the cross-hairs at the diaphragm and the optical center...
Level line
Any line lying on a level surface is called a level line. This line it normal to the plumb line (direction of gravity) at all points....
